Mail::Box::Locker::POSIX(3pm)				User Contributed Perl Documentation			     Mail::Box::Locker::POSIX(3pm)

NAME

       Mail::Box::Locker::POSIX - lock a folder using kernel file-locking

INHERITANCE

	Mail::Box::Locker::POSIX
	  is a Mail::Box::Locker
	  is a Mail::Reporter

SYNOPSIS

	See Mail::Box::Locker

DESCRIPTION

       This locker object is created by the folder to get an exclusive lock on the file which contains the data using the kernel's POSIX
       facilities.  This lock is created on a separate file-handle to the folder file, so not the handle which is reading.  Not all platforms
       support POSIX locking.

METHODS

   Constructors
       Mail::Box::Locker::POSIX->new(OPTIONS)
	    -Option    --Defined in	--Default
	     expires	 Mail::Box::Locker  1 hour
	     file	 Mail::Box::Locker  undef
	     folder	 Mail::Box::Locker  <undef>
	     log	 Mail::Reporter   'WARNINGS'
	     method	 Mail::Box::Locker  POSIX
	     posix_file 		  <undef>
	     timeout	 Mail::Box::Locker  10 seconds
	     trace	 Mail::Reporter   'WARNINGS'

	   expires => SECONDS
	   file => FILENAME
	   folder => FOLDER
	   log => LEVEL
	   method => STRING|CLASS|ARRAY
	   posix_file => FILENAME
	     Alternative name for "file", especially useful to avoid confusion when the multi-locker is used.

	   timeout => SECONDS|'NOTIMEOUT'
	   trace => LEVEL

   The Locker
       $obj->filename([FILENAME])
	   See "The Locker" in Mail::Box::Locker

       $obj->folder([FOLDER])
	   See "The Locker" in Mail::Box::Locker

       $obj->name()
	   See "The Locker" in Mail::Box::Locker

   Locking
       $obj->hasLock()
	   See "Locking" in Mail::Box::Locker

       $obj->isLocked()
       $obj->lock()
       $obj->unlock()
	   See "Locking" in Mail::Box::Locker

   Error handling
       $obj->AUTOLOAD()
	   See "Error handling" in Mail::Reporter

       $obj->addReport(OBJECT)
	   See "Error handling" in Mail::Reporter

       $obj->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])
       Mail::Box::Locker::POSIX->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])
	   See "Error handling" in Mail::Reporter

       $obj->errors()
	   See "Error handling" in Mail::Reporter

       $obj->log([LEVEL [,STRINGS]])
       Mail::Box::Locker::POSIX->log([LEVEL [,STRINGS]])
	   See "Error handling" in Mail::Reporter

       $obj->logPriority(LEVEL)
       Mail::Box::Locker::POSIX->logPriority(LEVEL)
	   See "Error handling" in Mail::Reporter

       $obj->logSettings()
	   See "Error handling" in Mail::Reporter

       $obj->notImplemented()
	   See "Error handling" in Mail::Reporter

       $obj->report([LEVEL])
	   See "Error handling" in Mail::Reporter

       $obj->reportAll([LEVEL])
	   See "Error handling" in Mail::Reporter

       $obj->trace([LEVEL])
	   See "Error handling" in Mail::Reporter

       $obj->warnings()
	   See "Error handling" in Mail::Reporter

   Cleanup
       $obj->DESTROY()
	   See "Cleanup" in Mail::Box::Locker

       $obj->inGlobalDestruction()
	   See "Cleanup" in Mail::Reporter

DIAGNOSTICS

       Warning: Folder $folder already lockf'd
       Error: Package $package does not implement $method.
	   Fatal error: the specific package (or one of its superclasses) does not implement this method where it should. This message means that
	   some other related classes do implement this method however the class at hand does not.  Probably you should investigate this and
	   probably inform the author of the package.

       Error: Unable to check lock file $filename for $folder: $!
	   To check whether the filename is used to flock a folder, the file must be opened.  Apparently this fails, which does not mean that the
	   folder is locked neither that it is unlocked.

       Error: Unable to open POSIX lock file $filename for $folder: $!
	   For POSIX style locking, a folder it must be opened, which does not succeed for the specified reason.

       Error: Will never get a POSIX lock at $filename for $folder: $!
	   Tried to lock the folder, but it did not succeed.  The error code received from the OS indicates that it will not succeed ever, so we
	   do not need to try again.

SEE ALSO

       This module is part of Mail-Box distribution version 2.105, built on May 07, 2012. Website: http://perl.overmeer.net/mailbox/

LICENSE

       Copyrights 2001-2012 by [Mark Overmeer]. For other contributors see ChangeLog.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  See
       http://www.perl.com/perl/misc/Artistic.html

perl v5.14.2							    2012-05-07					     Mail::Box::Locker::POSIX(3pm)